Blasting device



H. EQ HAYWARD BLASTING DEVICE June l5, 1937.

Filed July 22, 1933 Patented June 15, 1937 STATES i? TENT CFFICEBLASTING DEVICE Application July 22, 1933. Serial No. 881,680

26 Claims.

'I'his invention relates to an improved means for eiecting the dischargeof cartridges charged with high pressure air or other forms of potentialenergy at working pressures.

Referring to the drawing. the single figure is a a view in longitudinalsection illustrating a form of the invention.

'I'he cartridge body proper is indicated at I and it will be observedthat this body isinternally threadw ed at its opposite ends forreception of an extension 2 and a terminal cap 3. The extension 2 isalso internally threaded at one end for reception of a discharge cap 4.The terminal cap 3 is provided with a valve 5 and charging passages 6whereby a charge of high pressure air or other gas may be introducedinto the chamber formed in the main body I of the cartridge. Adjacentthe end of the body I opposite the terminal cap there is formed ashoulder on which a disc 8 is designed to be sealed by means of asuitable gasket. Likewise,

the extension 2 is provided with a shoulder adjacent to one of its endson which a disc 9 is adapted to be sealed by means of a suitable gasket.Thus, the discs 8 and 9 form between them a chamber 'I separate anddistinct from the main charge containing chamber formed in the body I ofthe cartridge. 'I'he extension 2 is also provided with a valve Il and acharging passage I2 for the introduction of high pressure air or othermedium. In the wall of the extension 2 there is provided a fusible plugI0 designed to be weakened or destroyed by the application of suitableelectrical current thereto.

Assuming that it is desired to use in the car- 35 tridge described abovea charge of compressed air at 10,000 pounds pressure, the rst step inthe charging of the cartridge would be to introduce into the chamber 'Ithrough valve I I and charging passage I2 a charge of compressed air atapproxi- 40 mately 5,000 pounds pressure. The discs 8 and 9 should be ofsumcient'strength to withstand 5,000 pounds pressure but of insuilcientstrength to withstand a pressure of 10,000 pounds. After the chamber Ihas thus been charged, the main charge of 10,000 pounds air pressure maybe introduced into the main chamber of the cartridge body I throughvalve 5 and charging passages 6. Thus, we have a condition under whichthe disc 8 is subjected to a pressure of 10,000 pounds per 50 squareinch on one side and to a pressure of 5,000 pounds per square inch onthe opposite side. Disc 9, however, is subjected to 5,000 poundspressure per square inch on one side and to atmospheric pressure on theopposite side. Under these con- 55 ditions and bearing in mind that bothdiscs 8 and 9 are calculated to withstand a pressure of 5,1' pounds persquare inch, but to fail at a pressuof 10,000 pounds per square inch, itwill be evident that if the pressure contained in chamber 'l is ventedto the atmosphere the discs 8 and 9 will fail in rapid succession underthe influence of the 10,000 pounds per square inch pressure in the mainbody of the cartridge. This result is achieved by passing currentthrough the fusible plug I0, thereby causing it to blow out under the mlnuence of the 5,000 pounds pressure in chamber 1.

It will be understood that the present disclosure relates primarily tothe principles involved and that the details of construction,particularly as regards the fusible plug, may be widely varied.

I claim:

1. A blasting device comprising a substantially indestructible cartridgebody having formed therein a chamber for the reception of high pressureair or other form of fluid possessing poten- 20 tial energy, a disc forsealing said chamber and normally conning the charge therein, means foruniformly subjecting the entire exposed outer surface of said disc to auid pressure sumcient to maintain it against shearing under the innu- 25ence of the pressure exerted thereon from the main chamber of thecartridge, and means for releasing said uid pressure acting on the outersurface of said disc.

2. A blasting cartridge consisting of a substan- 3 tially indestructiblebody having formed therein a chamber adapted to receive a charge ofmaterial possessing potential energy, means for closing a dischargeopening for said chamber, said means being normally incapable ofwithstanding the pressure exerted thereon at said opening by the chargeof material possessing potential energy contained in said chamber, meansfor providing a counter-acting uid pressure on said closure means andmeans for relieving said counter-acting fluid pressure.

3. A blasting cartridge comprising a substantiallyl indestructible bodyhaving formed therein a chamber designed to receive a charge of materialpossessing potential energy at working pressure, a rupturable disc forclosing said chamber, means associated with said body for forming anauxlliary chamber on the opposite side of said disc, means forintroducing pressure into said 5o auxiliary chamber and means forrelieving said pressure.

4. A blasting device comprising a substantially indestructible cartridgehaving a chamber adapted to receive a charge of material possessingpotential energy at work performing pressure, controllable means forretaining said charge in said chamber including a body of fluid confinedat a pressure greater than atmospheric pressure, and fusible meansoperable to effect a reduction in the pressure of said fluid to causesaid retaining means to release said charge.

5. A blasting device comprising a substantially indestructible cartridgehaving a chamber adapted to receive a charge of material possessingpotential energy at work performing pressure, charge confining fluidpressure controlled means for closing said chamber, said means heldclosed by a pressure distinct from the pressure in said chamber, andelectricallyoperated means for relieving the holding pressure of saidfluid pressure controlled means to bring about release of said charge.V

6. A blasting device consisting of a substantially indestructible bodyhaving formed therein a chamber adapted to receive a charge of materialpossessing potential energy, means for closing said chamber, said meansbeing normally incapable of withstanding the pressure exerted thereon bythe charge of material possessing potential energy contained in saidchamber,

means associated with said body for forming an auxiliary chamber on theopposite side of said closure means, means for introducing pressure intosaid auxiliary chamber, and means for relieving the pressure in saidauxiliary chamber.

'7. A blasting device comprising a substantially indestructiblecontainer device having a chamber adapted to receive a work performingcharge of material possessing potential energy, a pair of spacedrupturable discs carried by the container device for forming between thesame a control chamber, means for introducing fluid under pressure intosaid auxiliary chamber to distribute the force of the charge of materialpossessing work performing potential energy between the two discs, andmeans for relieving the pressure from the auxiliary chamber to cause thecharge of potential energy to rupture both of said discs.

8. In a blasting cartridge, a container for receiving a blasting charge,a member for confining the charge in said container, means for uniformlysubjecting the entire exposed outer surface of said member to the actionof duid pressure sufficient to maintain said member against openingunder the influence of the pressure of the blasting charge, and meansfor releasing said member from the action of said fluid pressure actingon the outer surface of said member to cause the pressure of theblasting charge to open said member.

9. A blasting cartridge, a container for receiving a blasting charge andhaving a discharge opening for the blast, means under the action of theblasting charge for closing said opening to confine the charge in saidcontainer, said means being normally incapable of withstanding thepressure exerted thereon by said charge at said opening, means forproviding a sustaining fluid pressure on said closure means, and meansfor relievingv said sustaining fluid pressure to cause the pressure ofthe blasting charge to open said closure means.

10. In a blasting cartridge, a container having a chamber for receivinga blasting charge, a valve for confining the blasting charge in saidcontainer, means associated with said container for providing anauxiliary chamber at the opposite side of said valve from said chargereceiving chamber, means for introducing pressure into said auxiliarychamber, and means for relieving said pressure in said auxiliary chamberto cause the pressure of the blasting charge to open said valve.

11. In a blasting cartridge, a container for receiving a blastingcharge, controllable means for confining said charge in said containerincluding a body of fluid confined at a pressure greater thanatmospheric pressure, and fusible means operable to effect a reductionin the pressure of said fluid body to cause said conning means torelease said charge.

12. In a blasting cartridge, a container for receiving a blastingcharge, fluid pressure controlled mcans for confining under the actionof fluid pressure the blasting charge in said container, andelectrically operated means for effecting actuation of said fiuidpressure controlled means to effect release of the blasting charge.

13. In a blasting cartridge, a container for receiving a blastingcharge, means for confining said charge in said container, said meansbeing normally incapable of withstanding the pressure exerted thereon bythe pressure of the blasting charge, means associated with saidcontainer for forming an auxiliary chamber on4 the opposite side of saidconfining means, means for introducing pressure into said auxiliarychamber, and means for relieving the pressure in said auxiliary chamberto cause the pressure of the blasting charge to open said confiningmeans.

14. In a blasting cartridge, a container for receiving a blasting chargeat blasting pressure, a head attached to the inner end of saidcontainer, a discharge cap attached to the inner end of said head, andmeans associated with said container, said head and said discharge capfor confining the charge in said container and for controllablyreleasing the blasting charge from said container including blastingpressure rupturable elements positioned respectively by said head andcap.

15. In a blasting cartridge, a container for receiving a blastingcharge, a pair of spaced Valves carried by the container for formingbetween the same a control chamber. means for introducing uid underpressure into said control chamber to distribute the force of theblasting charge between the two valves, and means for relieving thepressure from the control chamber to cause the pressure of the blastingcharge to open both of said valves.

16. In a blasting cartridge, a container for receiving a blasting chargeat different blasting pressures below a predetermined maximum pressureand having a discharge orifice, controllable means for said orifice andlocated at the discharge end of the cartridge for confining a blastingcharge in said container including a body of fluid confined at apressure greater than atmospheric pressure, and means operable to effecta reduction in the pressure of said fluid to cause said confining meansto release the blasting charge regardless of the pressure in saidcontainer above a predetermined minimum pressure.

17. In a blasting cartridge, a container for receiving a blastingcharge, a valve for confining the charge in said container and operableto release the charge by the pressure of the charge bearing directlythereagainst, means for directly subjecting said valve to the action offluid pressure to counteract said blasting charge for maintaining saidvalve closed, and means for effecting a reduction in the pressure of thefluid to cause the pressure of the blasting charge 'w open said valve.9;.

18. A blasting deviceicomprising a substantially indestructiblecartridge having a chamber to receive a charge of material possessingpotential energy at work performing pressure, closure means for saidchamber for retaining said charge therein, fluid pressure controlledmeans acting on said closure means for maintaining the latter lo closed,and electrically operated means located exteriorly of said chargereceiving chamber for rendering said fluid pressure controlled meansineffective to hold said closure means closed.

19. In a blasting cartridge, a container for re- 15 ceiving a blastingcharge, a head attached to the inner end of said container, a dischargecap attached to the inner end of said head and having a dischargeorifice through which the blasting charge is discharged-from thecontainer, and

20 means associated with said container, saidvhead and said dischargecap for conning the charge in said container andvfor controllablyreleasing the blasting charge from saidlcontalner through said dischargecap orice including blasting pres- 25 sure release elements positionedrespectively .by

said head and cap.

20. In a blasting cartridge, a container for receiving a blasting chargeat different predetermined blasting pressures between a maximum 30blasting pressure and a minimum blasting pressure, fluid pressurecontrolled means at the discharge end of the cartridge for conning theblasting charge in said container and including a separate body ofcontrol iluid, and means under 35 remote control and at the dischargeend of the cartridge for eecting actuation of said fluid pressurecontrolled means by liberating said separate body of controlv fluid toeiect release of the blasting charge regardless of the particular blast-40, ing pressure in the container between said predetermined maximum andminimum pressures.

21..A blasting device comprising a cartridge having a chamber adapted toreceive a blasting charge at work performing pressure, differential 45fluid pressure operated discharge means for controllably releasing saidcharge from said chamber including operation initiating means fusible ata temperature less than the fusing temperature of the remainder of saiddischarge means,

50 and means for effecting fusing of said fusible means.

22. A blasting device comprising a cartridge having a chamber adapted toreceive a blasting charge at work performing pressure, means lo- 55cated entirely beyond one end of the chamber for normally confining saidcharge in and controllably releasing the charge from said chamberincluding an operation initiating element fusible at a temperature lessthan the fusing temperature of the remainder of said means, and meansunder remote control for effecting fusing of said fusible element.

23. In a blasting cartridge, a plurality of chambers to receive separateAcharges oi.' a gaseous blasting medium at different high pressures.means for discharging the charge from one of said chambers. and mieansresponsive to the discharging of the charge from said one chamber foreiecting discharge of the charge from the remaining chamber to thematerial to be blasted through said one chamber.

24. In a. blasting cartridge. a container for receiving a charge atblasting pressure, a control chamber for receiving a charge at apressure less than that of said container charge but above atmosphericpressure, means for separately charging said container and `said controlchamber, means for eifecting discharge of the charge from the controlchamber, and mseans responsive to the drop in pressure in the controlchamber for effecting discharge of the blasting charge from thecontainer to the material to be blasted through the control chamber.

25. A blasting device comprising a re-usable indestructible cartridgehaving a chamber adapted to receive a charge of uid possessing potentialenergy at work performing pressure, a tubular extension connected to oneend of said cartridge,-

a discharge cap connected to the outer end of the extension, fluidpressure operated means for sealing the charge receiving chamber fromthe interior of the extension, uid pressure operated means for sealingthe interior of the extension from the interior of the discharge cap,both of said fluid pressure operating means cooperating to retain thepotential energy charge in its chamber, and means associated with theextension for creating a iluld pressure condition therein which willeect operation of both of said uid pressure operated means to releasethe potential energy charge through said discharge cap.

26. In a blasting cartridge, a container for receiving a charge atblasting pressure and having a discharge opening, a control chamber forreceiving a separate charge at high pressure and connected to thecontainer to communicate therewith through its discharge opening, saidcontrol chamber having a discharge opening at its outer end, a dischargecap connected to the control chamber to communicate therewith throughits discharge opening, means for venting the charge from the controlchamber and release means for controlling both of said dischargeopenings operable upon venting of the charge from the control chamberfor releasing the blasting charge through the discharge cap.

HENRY E. HAYWARD.

